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(a2)4=(a4)2 2x3•5x2=10x6 (﹣c)8÷(﹣c)6=﹣c2 (ab3)2=ab6
a2+a4=a6 2a+3b=5ab (a2)3=a6 a6÷a3=a2
6a+a=6a2 ﹣2a+5b=3ab 4m2n﹣2mn2=2mn 3ab2﹣5b2a=﹣2ab2
x2y-2xy2=-x2y 2a+3b=5ab -3ab-3ab=-6ab a3+a2=a5
2a+3b=5ab (x+2)2=x2+4 (ab3)2=ab6 (﹣1)0=1
6a+a=7a2 ﹣2a+5b=3ab 4m2n﹣2mn2=2mn 3ab2﹣5b2a=﹣2ab2
2b的值为( ) A.3ab 6a 6ab 5ab
6a+a=6a2 ﹣2a+5b=3ab 4m2n﹣2mn2=2mn 3ab2﹣5b2a=﹣2ab2
x2y﹣2xy2=﹣x2y 2a+3b=5ab a3+a2=a5 ﹣3ab﹣3ab=﹣6ab
2+a=2a 2a﹣3a=1 3a+2b=5ab 5ab﹣ab=4ab
x2y﹣2xy2=﹣x2y 2a+3b=5ab a3+a2=a5 ﹣3ab﹣3ab=﹣6ab
2 5,则该反应的化学方程式为A. 2AB2 +B.2 == 2CB. 3AB2 +B.2 == 2C 4AB2 +B.2 == 2C AB2 + 4B2 == 2C
7a+a=7a2 -2a+8b=6ab -4m2n-2m2n=-6m2n 3ab2-5b2a=2ab2
6a+a=6a2 ﹣2a+5b=3ab 4m2n﹣2mn2=2mn 3ab2﹣5b2a=﹣2ab2
2a+3b=5ab (﹣1)0=1 (ab3)2=ab6 (x+2)2=x2+4